Rowing machine



FIG. 1 is a perspective view of a rowing machine showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a rowing machine, substantially as shown.